<?php
namespace OCA\Deckflow\Service;

use OCP\IUserSession;
use OCA\Deck\Service\DeckService;
use OCP\ILogger;
use OCA\Deckflow\DB\Migration;

class WorkflowService {

    private $userSession;
    private $deckService;
    private $logger;
    private $db;

    public function __construct(IUserSession $userSession, DeckService $deckService, ILogger $logger, \OCP\IDBConnection $db) {
        $this->userSession = $userSession;
        $this->deckService = $deckService;
        $this->logger = $logger;
        $this->db = $db;
    }

    /**
     * Holt alle Workflows des aktuellen Benutzers
     * @return array
     */
    private function getUserWorkflows() {
        $user = $this->userSession->getUser();
        $userId = $user ? $user->getUID() : null;

        // Hole alle Workflow-Konfigurationen des Benutzers aus der DB
        $result = $this->db->executeQuery("SELECT * FROM *PREFIX*deckflow_workflows WHERE user_id = ?", [$userId]);
        return $result->fetchAll();
    }

    /**
     * Verschiebt überfällige Karten für alle Workflows
     */
    public function moveOverdueCards() {
        $user = $this->userSession->getUser();
        if ($user === null) {
            return;
        }

        $workflows = $this->getUserWorkflows();

        foreach ($workflows as $workflow) {
            // Hole das Deck und die Stacks aus der Konfiguration
            $deck = $this->deckService->getDeckById($workflow['deck_id']);
            $sourceStack = $deck->getStackById($workflow['source_stack_id']);
            $targetStack = $deck->getStackById($workflow['target_stack_id']);

            // Überprüfe alle Karten im Quellstapel auf Überfälligkeit
            foreach ($sourceStack->getCards() as $card) {
                if ($this->isCardOverdue($card)) {
                    $this->moveCardToTargetStack($card, $targetStack);
                }
            }
        }
    }

    private function isCardOverdue($card) {
        $dueDate = $card->getDueDate();
        return $dueDate && $dueDate < time();
    }

    private function moveCardToTargetStack($card, $targetStack) {
        $this->deckService->moveCardToStack($card, $targetStack);
        $this->logger->info("Card moved to target stack.");
    }
}